Pattern-plate.



APatented Feb. 14, 1911.

9 DOD QQ.

. um@ n@ JUNE/72272- J. BAYER. PATTERN PLATE.

. APPLICATION FILED DEO.29, 1909.

UNITE STATES JOI-IN BAYER, OF CLEVELAND, OHIO.

PATTERN-PLATE.

To all whom it may concern: t

Be it known that I, Jeux Barrin, a citizen ot the United States,residing at Cleveland, in the county o'l Cuyahoga and State et Ohio,have invented a certain new and useful Improvement in Pattern-Plates, ofwhich the following is a full, clear, and exact description, referencebeing had to the accompanying drawings.

My invention relates to pattern plates for use in making molds t'or thecasting ol metal, by the use of which pattern plates sand molds may beeasily and quickly obtained without the necessity oit splitting theflask and withdrawing the pattern, which latter operation is frequentlyattended with accidents which destroy the sand mold and require itsbeing made over again. By the pattern plates which I here show, the copeand drag of a mold may be quickly .made by ramn'iing sand into Contactwith the pattern plate when held in a suitable itlask.

Furthermore, the invention defines a pattern plate or plates made oit' acomposition of such characteristics that the substance does not shrinkon cooling, when the pattern plate is irst made from the originalpattern.

The invention further comprises the elements and combinations thereotset i'orth in the acconipanying claims.

Reference should be had to the drawing, in which- Figure l is a planview of a pattern plate used to form the drag of a mold; Fig. 2 is aplan view of the same used to form the cope of a mold; Figs. 3, t and 5are sectional elevations through the flask and represent steps in theformation of the pattern plates; Figs. 6 and 7 are sectional elevationsthrough the mold and represent steps in the formation of the sand moldtrom the pattern plates; and Fig. S represents a completed sand mold.

In carrying out my invention, I have shown and will describe the makingot a sand mold by use of two pattern plates constructed in accordancewith my invention,

but it will be obvious that a single pat-w tern plate may be used, whendesired, and the use of a single pattern plate will be considered withinthe scope of this invention.

In the drawing I have shown my pattern plates constructed to form aplurality ot' castings in a single ask, although it will be obvious thata single casting may be formed Specification of Letters Patent.

Application filed December 29, 1909,

Patented Feb. 14, 191.1.

Serial No. 535,492.

,within the flask, where such may be desired. Furthermore, I have shownmy pattern plates for use in the formation ot a casting which issubstantially unilorm in thickness, so that the portions ot' thefinished castings which are raised will be complemented by acorresponding hollow portion upon the underside ot' the casting, but itwill be apparent that castings o'l' unequal thickness may be made withequal facility.

In carrying out the invention, I use the ordinary two-part flaskrepresented in Fig. 3 and place within this Vflask a pattern represented at Q, with which is joined or assembled a sprne 'former Il andrunners t anda like that shown in the view ol pattern plate f/ in Fig.l. Sand is employed to lill the flasks. This Vflask is filled with sandaccording to the well known manner of making a sand mold, and providesthe cope 1 and drag la. The cope and drag o't the `mold are thenseparated, the cope being inverted upon a new follow board 1b, and a newtop iframe G is placed thereon, as shown in Fig. el, into which ispoured the composition from which I form the pattern plate. Thiscomposition will then fill the cavities which have previously beenftormed in the sand, and when hardened the trame G and its contents willbe removed and will torm one oit my complete pattern plates marked a.The drag l ol the mold is also placed upright upon a suitable followboard l and provided with a new frame 7, (see Fig. 5) into which is putthe composition of which I form my pattern plate, and the same is allowed to cool and come into contact with the depressions and elevationso't the sand in the. cope. Vhen the composition is hard, the top iframeis removed and in this manner I secure the secondpattern plate asrepresented in Fig. 2.

The material ot which the pattern plate, or plates, as the case may be,is formed, consists of hard Trinidad asphalt, and in some instances Iadd to the asphalt a certain quantity of plumbago. Some grades of',lrinidad asphalt, when heated and cooled, produce a surface which issmooth and suttieiently so to give a good parting between the sand andthe pattern plate. Other grades of Trinidad asphalt do not give such agood parting, and with such I find it necessary to use plumbago. thenthe mixture is used, I combine the asphalt and plumbago in theproportion of forty of asphalt and one of plumbago, by weight, and bythe use of the plumbago invariably secure a surface upon the patternplate which gives good parting between the sand and pattern plate.

The asphalt alone, or the mixture, is heated to its melting point and ispoured into the top frame upon the sand having the impression of theoriginal pattern, as previously explained. rlhe top frame may becompletely filled with asphalt, or preferably I pour sufficient asphalt,or the mixture, into the frame to secure a thickness of about two orthree inches and allow the same to cool. rEhe asphalt seems to have thequality of flowing into all the crevices and lines which are made in thesand by the original y pattern, and thus give a faithful reproduction.The purpose of using a thin layer of the composition is thatthe same maybe rapidly cooled and thus prevent waste of time in forming the patternplates. The frame above the asphalt is then filled in with somesupporting material, such as plaster of Paris, and sets quickly. Theasphalt, or the mixture of the asphalt with the plumbago, whensolidified, produces a hard surface, and one which may be repeatedlyused in the formation of sand molds.

The composition here disclosed is non-- shrinkable, so that the originalpattern which is shown in Fig. 3 may be made of exact dimensions withthe article it is desired to finally produce as a casting, without t-henecessity of allowing for any shrinkage. Furthermore, the material is ofsuch composition that it readily takes all of the irregularities of thepattern and gives clear, sharp edges, so that all the lines which thesand will retain from the pattern will be reproduced in the compositionof which the pattern plate is made.

In forming the single molds by the use of the pattern plates, thepattern plate Z) shown in Fig. 2 is surmounted by a frame, and sand ispoured within the flask top, as represented in Fig. 6. rihe sand will becompacted in any well known manner, and then the sand mold removed fromcontact with the pattern plate Z), thereby producing the drag of a sandmold, which is the exact duplicate of the original drag la. The patternplate a, as shown in Fig. 7, will likewise be surmounted by a framewhich will be filled with sand and compacted, after which the frame maybe removed from the pattern plate, whereby there will be formed the copeof a sand mold, which is the exact duplicate of original cope l. Thecope l0 and drag 9, the formation of which have just been described,will then be assembled, as shown in Fig. 8, whereupon the metal may bepoured through the sprne 8 in a manner well known in the art.

By the use of the pattern plates I have here described, a sand mold maybe quickly made. Furthermore, the sand mold may be made without dangerof spoiling the mold, which is always incident when a mold is madedirectly from the pattern, because considerable experience and deftnessare required to successfully draw the pattern from the mold.Furthermore, the original master pattern may be preserved and notsubjected to the frequent use and consequent wear which would be thecase if it were the only pattern used.

Having thus described my invention, what I claim is:

l. A pattern plate formed principally of asphalt, with an admixture ofplumbago.

2. A pattern plate formed of asphalt and plumbago in substantially theproportions described.

3. A pattern plate formed of hard asphalt and plumbago in theproportions of about forty to one, by weight.

t. A pattern plate having a hard facing formed principally of asphaltand a backing for said facing, and a frame surrounding the facing andbacking.

5. A pattern plate having a facing formed principally of cast asphaltand a backing of plaster of Paris, with a frame surrounding the facingand backing.

6. A pattern plate having a hard facing formed principally of asphaltand a backing for said facing.

7. A pat-tern plate containing asphalt and plumbago.

In testimony whereof, I hereunto affix my signature in the presence oftwo witnesses. JOHN BAYER. Witnesses: rl

A. J. I-IUDsoN, BRENNAN B. VEs'r.

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